The mesh material allows you to easily see your project, which is incredibly useful for colorwork. The snaps on the opening of the bag provide a snag-free environment and act as a yarn bowl of sorts because you can feed the yarn through the snaps and work out of it while on the go. Each Oh Snap set comes with a mini dot journal for keeping track of rows, pattern notes, etc.
 
EXTRA LARGE: 10.5" tall x 14" wide x 2" deep
EXTRA XL: 13.5" tall x 16.5" wide x 2" deep
 
The XL fits up to five 100g sock hanks and the XXL fits up to twelve 100g sock hanks.